Blister (nonthermal) of right upper arm, sequela

This code signifies a non-thermal blister located on the patient's right upper arm, indicating a residual effect or complication from an initial injury or condition. It describes a healed or chronic stage of a blister, rather than an acute presentation.

Apply this code when documenting a patient presenting with a persistent or long-standing blister on the right upper arm that is not due to heat or cold exposure, and is considered a sequela. This would be appropriate for follow-up visits where the blister is a chronic issue or a complication of a previous injury.

• Always code the acute injury first, if applicable, with an appropriate seventh character for the initial encounter.
• Ensure documentation clearly specifies "nonthermal" and "sequela" for accurate code assignment.
• Verify laterality (right upper arm) is explicitly stated in the medical record.